downloads.dell.com€¦ · RIMMs and reinstall the new 512-MB RIMMs, beginning with socket RIMM4_B and working up on each riser board in mirror fashion. Dell does not recommend or

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Notes, Notices, and CautionsThroughout this guide, blocks of text may be accompanied by an icon and printed in bold type or in italic type. These blocks are notes, notices, and cautions, and they are used as follows:

NOTE: A NOTE indicates important information that helps you make better use of your computer system.

NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.

CAUTION: A CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

____________________

Information in this document is subject to change without notice.© 2001 Dell Computer Corporation. All rights reserved.

Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden.

Trademarks used in this text: Dell, Dell Precision, and the DELL logo are trademarks of Dell Computer Corporation.

Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own.

May 2001 P/N 9D775 Rev. A00

Dell Precision™ WorkStation 620System Memory Upgrade

This document provides instructions for upgrading the Rambus inline memory mod-ules (RIMMs) on the Dell Precision WorkStation 620. Dell Precision 620 systems support dual, direct, Rambus dynamic random-access memory (RDRAM) modules. These RIMMs feature error checking and correction (ECC).

NOTES: Dell recommends that only a technically knowledgeable person perform this procedure.

Dell recommends that you read the entire procedure before you begin. You must also be familiar with removing the system cover and locating the RIMMs.

Dell recommends that you print the contents of the system User’s Guide for referencing important information that may not be available during critical procedures. This document is available on your Dell Precision ResourceCD and can also be accessed from the User’s Guides icon on your current desktop if you have not reinstalled the operating system.

Upgrading the BIOSYou must upgrade the basic input/output system (BIOS) before you upgrade the RIMMs. Otherwise, the existing BIOS may not recognize the new RIMMs, and the system will not operate.

To upgrade the BIOS:

1. Download the BIOS update utility for the computer to be updated from the Dell support website.

a. Go to http://support.dell.com.

If this is your first time to use this website, complete the one-time registration.

b. Click Downloads for Your Dell.

c. Enter your Service Tag Number for the computer to be updated or select the appropriate Dell™ system.

support.dell.com System Memory Upgrade 1-1

d. Select the appropriate operating system (OS) and language for the computer to be updated.

e. Select FlashBIOS Updates for the download category.

f. Click Go and follow the instructions on screen to create a diskette containing the BIOS update files.

NOTE: For some Dell systems, you are given a choice to create a diskette con-taining the BIOS update files or to download a file you can use from the hard drive. Select the choice to use the file that creates an installation diskette.

2. Insert the BIOS update diskette into the diskette drive of the computer to be updated. Then restart the computer.

The computer automatically updates the BIOS from the diskette.

3. When the computer begins to restart and the Dell logo screen appears, remove the diskette from the diskette drive so that the computer does not boot from the diskette again.

Precautionary MeasuresNOTICE: Before you upgrade the RIMMs, you must upgrade the BIOS. See “Upgrading the BIOS” on page 1-1 for instructions.

Before you perform any of the procedures in this document, read the following notice for your personal safety and to prevent damage to the system from electrostatic dis-charge (ESD).

NOTICE: The procedure in this document requires that you remove the cover and work inside your computer. Do not attempt to service the com-puter except as explained in this document and elsewhere in Dell documentation. Always follow installation and service instructions closely.

Before Removing the CoverBefore you remove the computer cover, perform the following steps in the sequence indicated.

NOTICE: To help avoid possible damage to the system board, unplug your computer system and wait 15 to 30 seconds before removing a component from the system board or disconnecting a peripheral device from the computer.

1. Turn off the computer and any peripherals.

2. Disconnect the computer and peripherals from their power sources. Also, discon-nect any telephone or telecommunication lines from the computer.

Before disconnecting a peripheral from the computer or removing a component from the system board, verify that the standby power light, located on the sys-tem board, has turned off. If it is on, you may need to wait 15 to 30 seconds for it

1-2 System Memory Upgrade

to go out (see the internal system board label that is attached to the cover of your computer).

3. Ground yourself by touching an unpainted metal surface on the chassis, such as the metal around the card-slot openings at the back of the computer, before touching anything inside your computer. Dell recommends that you use a wrist grounding strap in this operation.

While you work, periodically touch an unpainted metal surface on the computer chassis to dissipate any static electricity that might harm internal components.

Doing so reduces the potential for personal injury or shock.

In addition, take note of these safety guidelines when appropriate:

• When you disconnect a cable, pull on its connector or on its strain-relief loop, not on the cable itself. Some cables have a connector with locking tabs; if you are dis-connecting this type of cable, press in on the locking tabs before disconnecting the cable. As you pull connectors apart, keep them evenly aligned to avoid bend-ing any connector pins. Also, before you connect a cable, make sure both connectors are correctly oriented and aligned.

• Handle components and cards with care. Do not touch the components or con-tacts on a card. Hold a card by its edges or by its metal mounting bracket. Hold a component such as a RIMM by its edges, not by its pins.

Upgrading System MemoryNOTICE: Before you upgrade the RIMMs, you must upgrade the BIOS. See “Upgrading the BIOS” on page 1-1 for instructions.

This computer has two memory expansion cards (MECs), both consisting of four sockets: RIMM1_A, RIMM2_A, RIMM3_B, and RIMM4_B. On each MEC, sockets RIMM1_A and RIMM2_A comprise channel A, and sockets RIMM3_B and RIMM4_B comprise channel B.

Dell Precision 620 systems support a maximum of eight RIMMs (four RIMMs per MEC) for up to 3 gigabytes (GB) of total memory.

NOTE: Although you can insert 512-megabyte (MB) RIMMs in each socket, the BIOS revision only supports a maximum of 3 GB.

Figure 1-1 shows the RIMMs and RIMM sockets.


Figure 1-1. RIMM Socket Designations

RIMM1_A

RIMM2_A

RIMM3_B

RIMM4_B

riser board

MEC cover

channel A

channel B


RIMM Installation GuidelinesYou must install RIMMs in pairs. This means that the RIMM in each socket on one MEC must be the same memory capacity, density, and speed as the corresponding RIMM in the same socket on the other MEC. Also, for either channel A or B of each MEC, if one socket contains a RIMM, then the other socket must contain either another RIMM or a continuity RIMM (CRIMM).

As an example, if you install only one pair of RIMMs in the RIMM1_A socket of each MEC, then you must install a CRIMM in socket RIMM2_A of each MEC. Channel B (sockets RIMM3_B and RIMM4_B) may remain empty, or it may contain one or two CRIMMs per MEC (see Figure 1-1).

However, if channel A contains two RIMMs and you want to install additional RIMMs, the preceding rules also apply for channel B.

NOTES: If 512-MB RIMMs are used, they must be populated starting with the bottom RIMM socket (RIMM4_B, the one closest to the system board) and working up. For example, see the configuration in the last row in Table 1-1. In this example, you would insert the 512-MB RIMMs into the bottom three sockets (RIMM4_B, RIMM3_B, RIMM2_A) and insert a CRIMM into the topmost socket (RIMM1_A).

When you add 512-MB RIMMs from a customer kit, you must remove all existing RIMMs and reinstall the new 512-MB RIMMs, beginning with socket RIMM4_B and working up on each riser board in mirror fashion.

Dell does not recommend or support the mixing of old and new 512-MB RIMMs in sockets RIMM1_A and RIMM2_A.

Table 1-1. Sample Factory-Installed RIMM Configurations (per MEC)

For TotalDesiredMemory:

Populate both MECs as follows:

RIMM1_A (top) RIMM2_A RIMM3_BRIMM4_B (bottom)

128 MB CRIMM 64 MB Empty Empty


384 MB 128 MB 64 MB CRIMM Empty




1024 MB 128 MB 128 MB 128 MB 128 MB


1536 MB 256 MB 256 MB 256 MB CRIMM

2048 MB 256 MB 256 MB 256 MB 256 MB


To upgrade memory, perform the following steps.

NOTICE: See “Protecting Against Electrostatic Discharge” in your System Information Guide.

CAUTION: Before you remove your computer cover, see “Safety First—For You and Your Computer” in your system User’s Guide.

1. If you have not already done so, upgrade the BIOS.

See “Upgrading the BIOS” on page 1-1 for instructions.

2. Turn off the computer and peripherals, disconnect them from their electrical out-lets, and wait 10 to 20 seconds.

3. Lay the computer on its right side.

4. Open the computer cover.

5. To lift the MEC from the system board, rotate the MEC cover up and remove the MEC from the computer (see Figure 1-1).

NOTE: For instructions, see “Removing and Installing a Memory Expansion Card” in your system User’s Guide.

6. Repeat Step 5 for the other MEC.

7. Install or remove RIMMs and CRIMMs as necessary to reach the desired mem-ory total.

NOTE: For instructions on installing RIMMs, see “Installing a RIMM” on page 1-8. For instructions on removing RIMMs, see “Removing a RIMM” on page 1-9.

8. Reinstall both MECs on the system board.

NOTE: For instructions, see “Removing and Installing a Memory Expansion Card” in your system User’s Guide.

9. Close the computer cover.

10. Stand the computer upright.

2048 MB Empty CRIMM 512 MB 512 MB

2560 MB CRIMM 256 MB 512 MB 512 MB

3072 MB 256 MB 256 MB 512 MB 512 MB

3072 MB CRIMM 512 MB 512 MB 512 MB

Table 1-1. Sample Factory-Installed RIMM Configurations (per MEC) (continued)

For TotalDesiredMemory:

Populate both MECs as follows:

RIMM1_A (top) RIMM2_A RIMM3_BRIMM4_B (bottom)


11. Reconnect the computer and peripherals to their power sources, and turn them on.

As the system boots, it detects the presence of the new RIMMs and automati-cally changes the system configuration information in system setup.

NOTES: Adding or removing RIMMs causes the following message to be dis-played at the next system start-up:

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After you replace the cover, if the chassis intrusion option is set to Enabled, the chassis intrusion detector causes the following message to be displayed at the next system start-up:

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12. Enter system setup. When Setup appears in the upper-right corner of the screen, press <F2>.

If you wait too long and the operating system begins to load into memory, allow the system to complete the load operation; shut down the system and try again.

NOTE: For instructions on using system setup, see the User’s Guide.

13. Reset the Chassis Intrusion option:

a. Press the down-arrow key to move to the System Security option.

b. Press <Enter> to access the System Security option's pop-up menu.

c. Press the down-arrow key to move to the Chassis Intrusion option.

d. Press the left- or right-arrow key to select Reset.

e. Choose Enabled, Enabled-Silent, or Disabled.

NOTES: The chassis intrusion default is Enabled.

If a setup password has been assigned by someone else, contact the network administrator for information on resetting the chassis intrusion detector.

See the system User's Guide for information on the chassis intrusion detector.

14. When the memory total is correct, press <Esc> to exit system setup.

If the memory total is incorrect, repeat steps 2 through 9. Check the installed MECs and modules to ensure that they are seated properly in their sockets. Then repeat steps 10 through 13.

If the memory total is still incorrect, contact Dell for technical support. See “Get-ting Help” in the User’s Guide.


15. Run the Dell Diagnostics to verify that the memory modules are operating properly.

NOTE: For information on troubleshooting and running the Dell Diagnostics, see “Troubleshooting” in the User’s Guide.

Installing a RIMMNOTICE: Before you upgrade RIMMs, you must upgrade the BIOS. See “Upgrading the BIOS” on page 1-1 for instructions.

If a RIMM is already installed in the socket you want to use, you must remove it. For instructions, see “Removing a RIMM” on page 1-9.

To install a RIMM, perform the following steps (see Figure 1-2):

1. Locate the plastic securing clips at each end of the socket. Press the clips out-ward until they snap open.

NOTICE: To avoid damage to the memory module, press the module straight down into the socket with equal force applied at each end of the module.

2. Press the memory module straight into the socket until the securing tabs snap into place around the ends of the memory module.

Figure 1-2. Installing a RIMM

securingclips (2)

socket


Removing a RIMMNOTICE: To avoid damage to the memory module, press the securing clips with equal force applied at each end of the socket.

To remove a RIMM, press the securing clips outward simultaneously until the RIMM disengages from the socket (see Figure 1-3). It should pop out slightly.

Figure 1-3. Removing a RIMM

securingclips (2)



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Documents

downloads.dell.com€¦ · RIMMs and reinstall the new 512-MB RIMMs, beginning with socket RIMM4_B and working up on each riser board in mirror fashion. Dell does not recommend or